<!DOCTYPE html>
<html>

<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        * {
            margin: 0;
            padding: 0
        }
        
        ul {
            list-style: none
        }
        
        .box {
            width: 600px;
            margin: 100px auto;
            border: 1px solid #000;
            padding: 20px;
        }
        
        textarea {
            width: 450px;
            height: 160px;
            outline: none;
            resize: none;
        }
        
        ul {
            width: 450px;
            padding-left: 80px;
        }
        
        ul li {
            line-height: 25px;
            border-bottom: 1px dashed #cccccc;
            display: block;
        }
        
        input {
            float: right;
        }
        
        ul li a {
            float: right;
        }
    </style>
    <script src="jquery.min.js"></script>
</head>

<body>
    <div class="box" id="weibo">
        <span>微博发布</span>
        <textarea name="" class="txt" cols="30" rows="10"></textarea>
        <button class="btn">发布</button>
        <ul>
        </ul>
    </div>
</body>

<script>
    $(function() {
        let txt = $('.txt');
        let btn = $('.btn');
        btn.on('click', function() {
            if (txt.val() == "") {
                alert('您未输入任何内容');
            } else {
                let li = $('<li></li>');
                li.html(txt.val() + '<a href="javascript:;">删除</a>');
                $('.box ul').eq(0).prepend(li);
                txt.val("");
            }
        })

        $('ul').on('click', 'a', function() {
            //console.log(this);
            $(this).parent().remove();
        })

    })
</script>

</html>